Kernel Panic: Memory Parity Error during cpio

While trying to install an update of INFORMIX 4.0 from floppy disk with cpio, SCO XENIX 2.3.4 gets a kernel panic because of a memory parity error. This happens on a 4MB COMPAQ 386. We are getting no errors in regular multiuser operation. So far, we have tried swapping out memory boards, but still get the same problem. Has anyone encountered a similar type problem with cpio? Or, have you had hardware problems that showed themselves in this way? Or had data on the cpio archive that caused this to happen? Thanks, Will Johnson